Updating changeLog

Author: panchagnula

src/Websites/Websites/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* fixes the issue where using  Set-AzWebApp and Set-AzWebAppSlot with -WebApp property was removing the tags
 
 ## Version 1.2.1
 * "Kind" property will now be set for PSSite objects returned by Get-AzWebApp